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how do you simplify this expression?

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1 Answer

Since all of the operations are addition and subtraction, we can remove the parentheses:
7n - n - 8n4 + 5n + 4n3 + 5n4
Now combine like-terms. Like terms have the same variable and exponent.  I'll group the like terms in parentheses so you can see them:
(-8n4 + 5n4) + (4n3) + (7n - n +5n)
-3n4 + 4n3 + 11n